For my wedding, we are doing a wooden letter like this for our "guestbook". Im buying a 2 foot unfinished wooden letter G for our last name. I want to paint it black and have white or gold signatures. Not sure if a matte spray paint or regular paint would be better or if makes a difference, and what kind of pens I should use for people to sign it. Should I seal it with something when it's all done to protect it? please help!